1210000021221 has 8 divisors (see below), whose sum is σ = 1613374088320. Its totient is φ = 806646317472.

The previous prime is 1210000021207. The next prime is 1210000021253. The reversal of 1210000021221 is 1221200000121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1210000021221 - 2¹⁰ = 1210000020197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1210000021197 and 1210000021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210000021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4951645 + ... + 5190258.

It is an arithmetic number, because the mean of its divisors is an integer number (201671761040).

Almost surely, 2^{1210000021221} is an apocalyptic number.

It is an amenable number.

1210000021221 is a deficient number, since it is larger than the sum of its proper divisors (403374067099).

1210000021221 is a wasteful number, since it uses less digits than its factorization.

1210000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10181675.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210000021221 its reverse (1221200000121), we get a palindrome (2431200021342).

The spelling of 1210000021221 in words is "one trillion, two hundred ten billion, twenty-one thousand, two hundred twenty-one".